`ast.parse` with lower `feature_version` is still allowed to parser `lazy import os`

[sobolevn]

Bug report

Code:

>>> import ast
>>> ast.parse('lazy import os', feature_version=(3, 12))

Works and parses lazy import on older python versions :(

It should produce something like:

>>> import ast
>>> ast.parse('lazy import os', feature_version=(3, 12))
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    ast.parse('lazy import os', feature_version=(3, 12))
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sobolev/Desktop/cpython/Lib/ast.py", line 46, in parse
    return compile(source, filename, mode, flags,
                   _feature_version=feature_version, optimize=optimize,
                   module=module)
  File "<unknown>", line 1
    lazy import os
                  ^
SyntaxError: Lazy imports are only supported in Python 3.15 and greater

I have a PR ready.

Linked PRs

• gh-152631: Fix ast.parse on lazy imports with older feature_version #152632